Hello. Please help, I'm a little confused. I'm aware the x and y genes determine whether someone is male or female but which way around is it? Is it: xx=male xy=female ...or... xy=female xx=male I'm also aware half genetic properties are from the father and half are from the mother but are all genetic strands on an x or y gene? I.e. are there only two strands (xx or xy) that contain all genetics material for the being. Thanks for your time. I look forward to your replies.